Page 5 - Section4.1.1-SWPPPCutSheet-FiltrexxSedimentControl

328 | Filtrexx ® Low Impact Design Manual | Version 8.0

3. Filtrexx ® Inlet protection shall be placed at locations indicated on plans as directed by the Engineer. Inlet protection should be installed in a pattern that allows complete protection of the inlet area.

4. Installation of curb Inlet protection will ensure a minimal overlap of at least 1 ft (300mm) on either side of the opening being protected. The Inlet protection will be anchored to the soil behind the curb using staples, stakes or other devices capable of holding the Inlet protection in place.

5. Standard Inlet protection for curb inlet protec- tion and curb sediment containment will use 8 in (200mm) diameter Inlet protection, and drain inlets on soil will use 12 in (300mm) or 18 in (450mm) diameter Inlet protection. In severe fow situations, larger Inlet protection may be specifed by the Engineer. During curb installa- tion, Inlet protection shall be compacted to be slightly shorter than curb height.

6. If Inlet protection becomes clogged with debris and sediment, they shall be maintained so as to assure proper drainage and water fow into the storm drain. In severe storm events, overfow of the Inlet protection may be acceptable in order to keep the area from fooding.

7. Curb and drain Inlet protection shall be positioned so as to provide a permeable physical barrier to the drain itself, allowing sediment to collect on the outside of the Inlet protection.

8. For drains and inlets that have only curb cuts, without street grates, a spacer is required in order to keep the Inlet protection away from the drain opening. This spacer should be a hog wire screen bent to overlap the grate opening and keep the sock from falling into the opening. Use at least one spacer for every 4 ft (1.2m) of curb drain opening. The wire grid also prevents other foatable waste from passing over the Inlet protection.

9. Stakes shall be installed through the middle of the drain Inlet protection on 5 ft (1.5m) centers, using 2 in (50mm) x 2 in (50mm) x 3 ft (1m) wood stakes.

10. Staking depth for sand and silt loam soils shall be 12 in (300mm), and 8 in (200mm) for clay soils.

INSPECTION and MAINTENANCE

Routine inspection should be conducted within 24 hrs of a runoff event or as designated by the regulating authority. Inlet protection should be regularly inspected to make sure they maintain their

shape and are producing adequate hydraulic fow-through. If ponding becomes excessive, additional Inlet protection may be required or sediment removal may be necessary. Inlet protection shall be inspected until contributing drainage area has been permanently stabilized and construction activity has ceased

1. The Contractor shall maintain the Inlet protection in a functional condition at all times and it shall be routinely inspected.

2. If the Inlet protection has been damaged, it shall be repaired, or replaced if beyond repair.

3. The Contractor shall remove sediment at the base of the upslope side of the Inlet protection when accumulation has reached 1/2 of the effective height of the Inlet protection, or as directed by the Engineer. Alternatively, for drain Inlet protection a new Soxx tm may be placed on top of the original increasing the sediment storage capacity without soil disturbance.

4. Inlet protection shall be maintained until disturbed area above or around the device has been permanently stabilized and construction activity has ceased.

5. Regular maintenance includes lifting the Inlet protection and cleaning around and under them as sediment collects.

6. The FilterMedia tm will be removed from paved areas or dispersed on site soil or behind curb once disturbed area has been permanently stabilized, construction activity has ceased, or as determined by the Engineer.

Grade (%) Spacing (ft) Spacing (mm)

0.5 100 30 1.0 50 15 2.0 25 8 3.0 16 5 4.0 13 4 5.0 10 3

Table 2.4 Spacing for Curb Sediment Containment Systems.

Source: Fifeld, 2001.